Why calling .sort() function on Pandas Series sorts its values in-place and returns nothing? [duplicate]

Answer 1

As with most other python iterables, Series.sort() does actually return nothing but sorts the Series in place. See for example sorting a python list:

In [2]: foo = [5, 3, 9]

In [3]: foo.sort()

In [4]: foo
Out[4]: [3, 5, 9]